Option variable
logabsDefault value: false
When doing indefinite integration where
logs are generated, e.g. integrate(1/x,x), the answer is given in
terms of log(abs(...)) if logabs is true, but in terms of log(...) if
logabs is false. For definite integration, the logabs:true setting is
used, because here "evaluation" of the indefinite integral at the
endpoints is often needed.